import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a =0;
        for (int i=1;i<3;i++){
            if (sc.nextLine()=="BLUE")a++;
        }
        if(a<=2)System.out.println("BLUE");
        else System.out.println("RED");
    }
}